@misc{indiciaeeb3ae6a2e99b,
  title = {Nonparametric tests for stratum effects in the Cox model.},
  author = {J Sun and I Yang},
  year = {2000},
  doi = {10.1023/a:1026501214397},
  url = {https://pubmed.ncbi.nlm.nih.gov/11190602/},
  note = {Source identifier: 11190602}
}